Hottest Questions This Week

3

votes

5

answers

1k

views

What is an example of an exothermic reaction with negative ∆S?

modified yesterday Maurice 17k

11

votes

1

answer

1k

views

Why measure both alkalinity and pH in pools if pH alone tells us how acidic or basic something is?

acid-base everyday-chemistry ph

modified Oct 20 at 4:16 uhoh 6,834

6

votes

1

answer

297

views

NMR terminology: "Transients"

nmr-spectroscopy

modified 2 days ago orthocresol♦ 61.6k

1

vote

1

answer

234

views

An atom moving at its root-mean-square speed at 20 °C has a wavelength of 32.8 pm. Identify the atom

gas-laws

modified Oct 20 at 22:03 Martin - マーチン♦ 41.5k

4

votes

1

answer

61

views

What do sequence numbers in PDB files actually mean and why don't they match the sequence?

biochemistry proteins cheminformatics crystallography x-ray-diffraction

modified Oct 19 at 12:31 Karsten Theis 26.6k

0

votes

1

answer

60

views

What exactly is giant covalent molecule?

molecular-structure molecules covalent-compounds

modified Oct 19 at 11:40 Buttonwood 21.1k

2

votes

3

answers

67

views

If a carbonic acid to bicarbonate reaction involves the release of H+, why does pH increase?

ph

modified 19 hours ago BrownBag 56

1

vote

1

answer

77

views

Question on theoretical existence (or lack thereof) of spherical symmetry of flerovium and/or oganesson

quantum-chemistry theoretical-chemistry relativistic

modified Oct 21 at 21:07 Oscar Lanzi 33.3k

0

votes

1

answer

57

views

Synthetic Autunite reaction with HCl

reaction-mechanism

modified Oct 20 at 20:41 Maurice 17k

2

votes

2

answers

46

views

The effect of changing the pressure on an equilibrium

equilibrium

modified Oct 21 at 20:18 Karsten Theis 26.6k

0

votes

1

answer

39

views

What would the mechanism be for intermediate B to Supinidine, and what would by product C be?

organic-chemistry reaction-mechanism organosilicon-compounds

modified 2 days ago Waylander 17.2k

0

votes

1

answer

34

views

Is the density of a mixture ever just the sum of the densities of each species in the mixture? [closed]

mixtures density

answered Oct 20 at 8:24 Poutnik 23.2k

0

votes

1

answer

41

views

How is reversible expansion work a state function?

physical-chemistry thermodynamics

modified Oct 21 at 19:25 Chet Miller 11.4k

-2

votes

1

answer

40

views

Is each bag of plastic a polymer/macromolecule? If yes, why does it tear so easily? [duplicate]

physical-chemistry bond molecular-structure energy polymers

modified yesterday Buttonwood 21.1k

4

votes

0

answers

62

views

Could a positron be made to stably orbit an atom?

quantum-chemistry orbitals atomic-structure nuclear-chemistry

asked yesterday frogeyedpeas 237

1

vote

1

answer

35

views

is this compound meso? trans-1,4 dimethylcyclohexane [duplicate]

organic-chemistry symmetry

answered Oct 20 at 16:40 keys 49

-1

votes

1

answer

44

views

Is there a way to put helium or any other gas into food?

gas-laws food-chemistry

answered Oct 21 at 2:10 DrMoishe Pippik 22.6k

-1

votes

1

answer

44

views

why do we need to assign ΔH =0 for the formation of aqueous hydrogen ions? [duplicate]

thermodynamics

modified Oct 20 at 19:55 Maurice 17k

1

vote

0

answers

55

views

Why electron configuration of thulium is $[\ce{Xe}]~\mathrm{(6s)^2(4f)^{13}}$ instead of$[\ce{Xe}]~\mathrm{(6s)^1(4f)^{14}}$?

electrons electronic-configuration

modified Oct 18 at 12:56 Oscar Lanzi 33.3k

0

votes

0

answers

54

views

What's an example of something that is a strong base, and a strong oxidixing agent?

inorganic-chemistry

modified yesterday Oscar Lanzi 33.3k

0

votes

0

answers

50

views

Why is the NMR result for my p-toluic acid product so odd?

organic-chemistry nmr-spectroscopy

modified Oct 20 at 9:44 poorchemstudent 61

-1

votes

1

answer

30

views

How many characters does the SMILES notation uses?

notation

answered 6 hours ago Buttonwood 21.1k

0

votes

0

answers

49

views

+200

Reversible compression and proving relation with state function

thermodynamics gas-laws ideal-gas

modified yesterday 冰淇淋 94

-2

votes

0

answers

47

views

Need help with understanding the octet rule [closed]

bond

modified Oct 19 at 19:03 Ivan Neretin 29.1k

-1

votes

0

answers

46

views

How is it possible for red alcohol to be used in lab thermometers to boil liquids if its boiling point is so low?

alcohols temperature

modified Oct 21 at 6:21 Buttonwood 21.1k

-1

votes

1

answer

35

views

Is there any way to make ferrofluids float on water?

magnetism

answered yesterday DrMoishe Pippik 22.6k

0

votes

0

answers

43

views

When is the density of a mixture just the sum of the densities of each species in the mixture? [closed]

mixtures

modified Oct 18 at 20:38 Oliver Abdul 19

-1

votes

1

answer

33

views

Does pressure affect rate constant? [duplicate]

physical-chemistry kinetics

modified Oct 18 at 12:17 andselisk♦ 33.8k

-1

votes

1

answer

33

views

What volume does CO2 converted from O2 have?

mole

answered yesterday Poutnik 23.2k

-1

votes

1

answer

41

views

How to separate manganese(IV) oxide and chromium(III) hydroxide?

inorganic-chemistry separation-techniques

modified 5 hours ago andselisk♦ 33.8k

-3

votes

0

answers

41

views

If the mass of a sample of radioactive iron-59 decays from 60.3 micrograms to 22.1 micrograms in 64.4 days, what is the half-life of iron-59? [closed]

radioactivity

modified Oct 21 at 9:42 sjb-2812 1

-1

votes

0

answers

40

views

What is the correct expression for ionization constant of water?

equilibrium aqueous-solution

modified 15 hours ago andselisk♦ 33.8k

1

vote

1

answer

31

views

Kappa convention in additive nomenclature

inorganic-chemistry nomenclature

answered Oct 20 at 15:08 Buttonwood 21.1k

0

votes

1

answer

39

views

Effect of amount of substance on equilibria

inorganic-chemistry acid-base equilibrium redox

modified 4 hours ago Maurice 17k

2

votes

0

answers

38

views

How do the assumptions of the Nernst equation impact its accuracy?

electrochemistry equilibrium ions nernst-equation

asked Oct 20 at 9:01 Ahmed 21

0

votes

0

answers

38

views

How to know the wavelength if the number of spectral emission lines is given? [closed]

quantum-chemistry

asked Oct 18 at 15:38 NoName 83

-1

votes

1

answer

29

views

Why in calculating 25 mM of Tris HCl the answer in gram is automatically refer to the gram in 1000 ml [closed]

physical-chemistry analytical-chemistry physical-organic-chemistry

modified Oct 19 at 7:56 Poutnik 23.2k

0

votes

0

answers

37

views

How to express concentration in terms of conversion of a component in parallel reactions?

reaction-control chemical-engineering reaction-order rate-equation

modified yesterday Buttonwood 21.1k

-2

votes

0

answers

37

views

Can hydrogen peroxide decompose? [closed]

inorganic-chemistry experimental-chemistry

asked Oct 21 at 2:05 woo 1

0

votes

1

answer

36

views

Help determining Absorption Coefficient & Concentration from Uv-Vis reading

biochemistry spectrophotometry

answered 2 days ago SomeRandomGuy 1

-1

votes

0

answers

36

views

Question about moles and volume of gases in reaction in relationship to each other [closed]

mole

modified Oct 19 at 19:54 ThatStudent 9

0

votes

0

answers

35

views

The things that make no sense to me in the pressure-composition phase diagram(P vs x and y)

physical-chemistry aqueous-solution solutions pressure vapor-pressure

modified 2 days ago aaravm 9

1

vote

0

answers

35

views

Reactivity with rubbing alcohol and PVC

organic-chemistry

modified Oct 20 at 17:02 Lubos Bocian 1

0

votes

0

answers

34

views

Whether the set of non-relativistic atomic orbitals can be unitarily transformed into the corresponding set of relativistic atomic orbitals

quantum-chemistry theoretical-chemistry hybridization relativistic

modified yesterday Kanghun Kim 446

-3

votes

0

answers

34

views

What are the products and resulting pH for the reaction between potassium bicarbonate and white vinegar? [closed]

inorganic-chemistry acid-base

modified Oct 20 at 16:13 andselisk♦ 33.8k

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